#define   _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int find_1(int n)
{
    int count = 0;
    for (int i = 31; i >= 0; i--)
    {
        if (((n >> i) & 1) == 1)
        {
            count++;
        }
    }
    return count;
}
int main()
{
    int n = 0;
    scanf("%d", &n);
    int ret = find_1(n);
    printf("%d", ret);

    return 0;
}